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Geissmann, T.; Thanh, V.N.; Dine, M.C.; Tiep, T.M.
Results of a gibbon survey in the Kim Hy Nature Reserve (Bac Kan province) in northeastern Vietnam
2009 Full Book
The cao-vit crested gibbon (_Nomascus nasutus_) is one of the wold's most endangered primate species, with one single protected forest patch in the border area between Cao Bang province (Vietnam) and Guangxi province (China) supporting the last known population. No other locality is known to support a population of this species, however, some gibbons are rumoured to have survived in Kim Hy Nature Reserve of Bac Kan province (northeastern Vietnam). In contrast to earlier surveys in Kim Hy, several interviewees suggested that gibbons were extinct in the area. On average, their most recent evidence for the occurrence of gibbons in Kim Hy dated from 2001. Other mammals recorded during the interview survey include clouded leopard, tiger (calls heard 1-3 years ago), and Asiatic golden cat.
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